Re: [patch 10/21] buffer heads: Support slab defrag

Christoph Lameter
2008-05-19T16:44:30Z

On Mon, 19 May 2008, David Chinner wrote:

> Defragmentation is triggered as part of the usual memory reclaim
> process. Which implies we've run out of free memory, correct?

Yes but we have already reclaimed some memory.

> > How do you trigger such a special writeout?
>
> filemap_fdatawrite_range() perhaps?

Could you provide me such a patch? I would not know how much to writeout.
If we had such a method then we could also use that for the swap case
where we also write out single pages?